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Geologicat UcluucsW Page 4 <br /> ' Gioundwater Monitoring Report <br /> Project No 770 2 <br /> . May 28,2003 <br /> ' 1.2 Groundwater Sampling Procedure <br /> ' On January 28, 2003, Geological Technics Inc staff mobilized to the site to measure depth <br /> to groundwater in the site's monitoring wells On February 6, 2003, Del-Tech Geotechnical <br /> Support Services staff mobilized to the site to measure depth to groundwater in the site's <br /> ' monitoring wells <br /> On March 19, 2003, Don Light of Del-Tech Geotechnical Support Services again mobilized <br /> to the site to complete the quarterly groundwater monitoring and sampling of the site's <br /> monitoring wells Before sampling was attempted the wells were sounded for depth to <br />' water and then a clear disposable bailer was used to determine if floating product was <br /> present No free product was noted for the event however wells MW-4 and MW-5 <br /> contained product sheen The wells were purged of at least three well volumes of stagnant <br />' water using a dedicated Waters check-ball assembly and % inch tubing Purging continued <br /> until the temperature, conductivity and pH of the groundwater stabilized (<10% variation <br /> among three readings} indicating that formation water representative of aquifer conditions <br />' was entering the wells These water quality parameters were measured at intervals of each <br /> well volume purged <br /> Once purging was complete, a water sample was collected from the Waterra tube Care was <br /> taken to minimize sample agitation Once the sample container was filled and capped, the <br /> bottle was inverted, tapped and checked for headspace bubbles The sample container was <br />' identified and labeled with a unique designation, inserted into foam holders and placed into <br /> an ice chest cooled to 4°C for transport to the laboratory <br /> All non-disposable sampling equipment was decontaminated using a hot water washer and <br /> detergent before and between uses Disposable gloves were used by the technician to <br />' collect all samples and were changed with each sample collection <br /> A chain of custody document, listing all samples collected, accompanied the samples from <br />' field to laboratory, thereby providing a means to track their movement and insure their <br /> integrity <br />' All water purged from each monitoring well and not used as a sample was placed in a <br /> propel ly labeled 55 gallon DOT approved container and stored on site until its proper <br /> disposition can be arranged <br /> Groundwater monitoring field logs are included in Appendix C <br />